Studies on the Chemical Modification of Arginine
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a study on the effectiveness of textual modification on the improvement of iranian upper-intermediate efl learners’ reading comprehension
این پژوهش به منظور بررسی تأثیر اصلاح متنی بر بهبود توانایی درک مطلب زبان آموزان ایرانی بالاتر از سطح میانی انجام پذیرفت .بدین منظور 115 دانشجوی مرد و زن رشته مترجمی زبان انگلیسی در این پزوهش شرکت نمودند.
Studies on the chemical modification of arginine. I. The reaction of 1,2-cyclohexanedione with arginine and arginyl residues of proteins.
The guanido group of arginine condenses with 1, Z-cyclohexanedione in alkaline aqueous medium to form a new a-amino acid. The product (1 ,2-cyclohexanedione-arginine) was shown by independent synthesis to be N5-(4-0x0-1,3diazaspiro[4.4]non 2 ylidene) L ornithine. At hydroxide concentrations of 0.2 N or higher, this was the principal product, and the reaction with free arginine and with the argi...
متن کاملStudies on the chemical modification of trypsin.
Many effects of dibenamine (Â /V-dibenzyl-/?chloroethylamine) on physiological systems have been reviewed by Graham1 and Nickerson2. However their effect on enzyme activity was not reported till Beddoe and Smith 3 observed that dibenamine also reacts with acetylcholinesterase under rather specific conditions in an irreversible manner to give an in active modified enzyme. The inhibiting compoun...
متن کاملChemical Modification of Arginine with 1,2-cyclohexanedione.
5. GUTFREUND, El., Trans. Faraday Sot., 61, 441 (1955). 6. WALBFI, K. A., KAUFFMAN, D. L., SAMPATH KUMAR, K. S. V., AND NEURATE, H., Proc. Natl. Ad. Sci. U. S., 51, 301 (1964). 7. WALSH, K. A., AND NEURATH, H., Proc. Nail. Acad. Sci. U. S., 52, 884 (1964). 8. MARE&GUIA, M., AND SHAW, E., Federation Proc., 22, 528 (1963). 9. CRESTFIELD, A. M., STEIN, W. H., AND MOORE, S., J. Bid. Chem., 238, 241...
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Rat liver S-adenosylhomocysteinase (EC 3.3.1.1) is inactivated by phenylglyoxal following pseudo-first order kinetics. The dependence of the apparent first order rate constant for inactivation on the phenylglyoxal concentration shows that the inactivation is second order in reagent. This fact together with the reversibility of inactivation upon removal of excess reagent and the lack of reaction...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1967
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)96229-0